GenomeScan

GenomeScan identifies exon-intron structures and predicts encoded protein sequences from genomic DNA across organisms, with emphasis on human and other vertebrates, by integrating splice signal models and sequence similarity information.

Key Features:

• Integrated Model Approach: Combines models of exon-intron composition and splice signal patterns with sequence similarity data, including BLASTX hits to known protein sequences.
• High Accuracy and Efficiency: Demonstrates high accuracy in exon-intron structure prediction on finished and draft human genome sequences with a low false positive rate.
• Comprehensive Gene Identification: When applied to 2.7 billion bases of human genomic DNA, identified 20,000–25,000 human genes, representing a substantial fraction of the estimated 30,000–40,000 genes.

Scientific Applications:

• Gene identification in higher eukaryotes: Provides automated identification of genes and their exon-intron structures in higher eukaryotic genomes.
• Draft genome annotation: Supplies first-level annotation for draft genomes, including draft human genome sequences.
• Support for biological interpretation: Facilitates identification of protein-coding genes and subsequent study of genetic functions.

Methodology:

Integrates exon-intron and splice signal models with sequence similarity information (e.g., BLASTX) to combine structural genomic features and evolutionary conservation for gene prediction.